in cuBul ABCDA'B'C'D' , distanta de la mijlocul M al muchieiCC' la planul (D'DB) este de 3 radical din 2 .Calculati a) aria sectiunii diagonaleD'B'BD b) d(M;A'D') c) cos unghiului (MD'B);(DBC)

  3.62 units

Step-by-step explanation:

The mnemonic SOH CAH TOA reminds you of the relation between the side adjacent to the angle and the hypotenuse:

  Cos = Adjacent/Hypotenuse

  cos(34°) = AB/AC

  AC = AB/cos(34°) = 3/cos(34°) ≈ 3.619 ≈ 3.62 . . . units

For right triangle ABC with A an angle of 34°, AB of length 3, and AC the hypotenuse.